NOVEL FLUORESCENT DERIVATIVES OF Α-HYDROXY-BISPHOSPHONATES AS SCALE INHIBITORS AND METHODS OF PRODUCING SAME Russian patent published in 2019 - IPC C09K11/06 C09B57/08 C07D221/14 C02F5/14 

FIELD: chemistry.

SUBSTANCE: invention relates to novel fluorescent derivatives α-hydroxy-bisphosphonates for use as scaling inhibitors. Described are compounds (I) as fluorescent scaling inhibitors. Method for production thereof involves acylation of primary aliphatic amino acids with the number of CH₂- links 1,3,6 by 4-bromo-1,8-naphthalic anhydride at boiling in ethanol in presence of triethylamine, methoxylation of 4-bromo-(N-alkylcarboxy)-1,8-naphthalimides with potassium carbonate in methanol, reaction with thionyl chloride, phosphorylation of 4-methoxy-(N-alkylcarboxy)-1,8-naphthalimides chloride with tris (trimethylsilyl) phosphite and methanolysis. Described also is an alternative method for production thereof, involving acylation α-aminobisphosphonic acids with the number of CH₂- links 1,3,6 4-bromo-1,8-naphthalic anhydride in the presence of triethylamine and 4-dimethylaminopyridine while boiling in ethanol, methoxylation α-hydroxy-bisphosphonates of 4-bromo-N-alkyl-1,8-naphthalimide with potassium carbonate in methanol and extraction of the end product using known methods.

EFFECT: invention provides prevention of sedimentation of slightly soluble salts of alkali-earth metals and possibility of rapid analysis and monitoring of concentration of inhibitor in water circulation systems in real time without sampling and changing color of working solution.

6 cl, 1 tbl, 12 ex